Even buy-and-hold investors can't afford to let their portfolios collect cobwebs. Valuations and fundamentals change perpetually, and shareholders need to know when there's more potential for growth elsewhere. Here we take a look at some online travel agency stocks worth swapping: Expedia and Priceline.

Philadelphia Eagles quarterback Michael Vick, still atoning for his role in an illegal dog-fighting ring, reportedly asked for $100,000 to address the Animal Friendly Association at Richard Stockton College. It's completely untrue, but like all gossip, the lie has spread faster than Vick can evade a tackle.

In 1999, Priceline saw its stock surge to absurd heights before it had earned a cent in profit, and after the bubble burst, it lost more than 99% of its value. But from that low, the discount travel site began a hard journey to profitability that has proven there are second acts in dot-com companies' lives.

The Internet rumor mill has actor William Shatner being proclaimed a financial genius for supposedly reaping $600 million from being Priceline's spokesman. But the numbers don't add up -- it's not logical, as Spock would say.